General Cycling Discussion - Internal hub ?
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07-02-08, 07:27 AM
Specifically a shimano nexxus 8 hub. Do I need horizontal dropouts, and if not do I need a special tensioner? tia :)
07-02-08, 08:23 AM
You need horizontal dropouts, OR a chain tensioner, OR you need to find that perfect front chainring/rear sprocket combination for the correct chain tension, OR buy a frame from http://steelwoolbicycles.ca/ with an eccentric bottom bracket shell.
Basically an internal hub is the same as a single speed bicycle in setup.
See what Sheldon has to say about single speeds and fixed gear.
07-02-08, 08:37 AM
A Shimano Nexus 8-speed hub will work on a vertical dropout bike. Its not as simple as saying, 'its the same as a single speed hub'. Various components of the hub need to 'indexed' or 'aligned' to properly function. Verticlal dropouts vs. horizontal vs. reverse dropouts all poistion the mechanisms in a different orientation.
To account for these differences Shimano provides a variety of 'ant-turn' washers, which in turn properly orient the hub various mechanisms.
Refer to this link: http://bike.shimano.com/media/techdocs/content/cycle/SI/Nexus/SG-8R20/34R0D-SG-8R20-EN_v1_m56577569830600211.pdf for installation instruction including washer descriptions.
With vertical dropouts, as d2create mentioned, you'll either need:
1. That magical tooth combination or
2. A chain tensioner.
That being said, I have 4-speed Nexus 'freewheel' setup and cant say enough about it.
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